What's interesting is that someone brought this to our attention when my husband and I were attending church years ago. Instead of bashing the person, we heard them out and re-read the Scripture and common sense kicked in big time. My conclusion is that there were other human beings on earth before Cain and Abel and even before Adam and Eve. How else would Cain be concerned of someone murdering him if there were no other human beings on earth? Great article by the way!